In February 2010, a killer whale named Tilikum dragged his SeaWorld trainer into the pool and drowned her. It was the third time the orca had been involved in a death during his 27 years in captivity. This is his story.

For 60 years, American drivers unknowingly poisoned themselves by pumping leaded gasoline into their tanks. Clair Patterson—a scientist who helped build the atomic bomb and discovered the true age of the Earth—took on a billion-dollar industry to save humanity from itself.